Hammer for rotary crushers



June 18, 1929 w. c. BRIGGS l HAMMER FOR- ROTARY CRUSHERS Filed Nov. 8, 1928 Patented .lune 18, 1929.

Uhll'l STATES PATENT OFFECE..

WILLIAM C. BRIGGS, OF ELKINS PARK, PENNSYLVANIA.

HAMMER FOR, ROTARY CRUSHERS.

Application iled November The present invention relates to hammers for rotary Crushers which include a shank and a renewable tip.

rJlhe principal object of the present invention is to utilize the weight of both the shank and the tip for effecting the crushing blow,or otherwise stated, to provide for automatically taking up the lost motion which inevitably exists in practice in the joint between the shank and the renewable tip by reason of the character of the materials employed and by reason of the commercial obstacles presented to the attainment and maintenance of a perfect or substantially perfect lit.

Another object of the invention is to effect the end above referred to in an economical manner.

.l attain the iirst of the objects above referred to automatically by hingedly mounting the tip on the shank and arranging the maj or portion of the weight of the tip in advance of the hinge, whereby the tip and the shank bear against surfaces provided between them as the result of the action of centrifugal force to which both the tip and the shank are subjected in use, and thus lost motion is taken up. This is in contra-distinction to present constructions lwith which l am acquainted and in which the tip moves under centrifugal force away from the end of the shank to the limit of lost motion in the joint thereby limiting the effectiveness of the crushing blow to the weight of the tip.

The invention also comprises the improvements to be presently described and finally claimed.

n the following description reference will be made to the accompanying drawing forming part hereof and in which Figure 1 is a side view of a hammer including a shank and a renewable tip and embodying features of the invention, and

Fig. 2 is a side view of the same.

In the drawing' l is a shank and 5 is a renewable tip. There is a `,hook element provided on each of said parts and one of said hook elements is indicated at t, and the other of said hook elements is indicated at 8. The hook elements provide an interlocking hinge connection. There are opposed surfaces provided between the tip and shank and they are adapted to operate as a stop for the hinge and to take the reaction of centrifugal force as well as the reaction of the crushing blow. These surfaces are indi- 8, 1928. Serial No. 317,929.

cated at 9 and l0. The center of gravity of the tip is so disposed with relation to the hinge that the tip is held against the stop by centrifugal force. Another way to describe the matter is to say that in use contact between the surfaces 9 and 10 is maintained by a force which is the resultant of the kcentrifugal force acting on the shank and the centrifugal force acting on the tip. The point of suspension of the shank at 2 and the hinge of the tip are angularly displaced with respect to the crusher shaft. The Crusher shaft is not shown because it is too well understood to require illustration and description, and this is also true of the hub on the crusher shaft to which the shanks are pivoted as at 2.

Considering the machine in operation the action of centrifugal force upon the shank if unrest-rained is to put the shank intoradial position with respect to the center of the shaft. rlfhe action of centrifugal force upon the tip by reasonof its disposition of weight and hinge connection is to turn it about its hinge connection so that its surface l0 dcpends upon the surface 9 of the shank rilie result of this is that whatever lost motion there is in the joint, one form of which will be presently described, by which the tip is connected with the shank is automatically taken up. The joint is susceptible of embodiment in various forms. As shown the shank is provided with a groove as at 3 and the tip is provided with a tongue arranged in the groove. The pin 6 headed as at Y is shown as passing through the walls of the groove of the tongue. It may be said that the lost motion to which reference has been made existing in the jeint between. the tip and shank is due to the fact that neither the lit of the pin nor of the other parts is as a practical matter tight, ner can it well be made tight in practice because the tip is usually of manganese steel which is difficult to provide with accurate dimensions. ln the. present invention any fitting that may be required can be done by grinding at the surfaces 9 and 10, by way of example, at the dash and dot line 11. In assembling the parts of the structure shown the hook elements may be engaged, the tongue swung into the groove, and the pin 6 inserted. The function of the pin 6 may be described as merely to connect the tip with the shank. As has been indicated in this description the only working connection between the tip llO and shank consists of the hinge connection provided by the hook elements, the surfaces which operate as a stop, and the distribution of the weight of the tip so that its centerof gravity will be in lead of the hinge.

It will be obvious to those skilled in the art to which the invention relates that modications may be made in details of construction and arrangement and matters of mere form withoutdeparting from the spirit of the invention which is not limited to such matters or otherwise than the prior art and the appended claims may require.

I claim:

l. A hammer for rotary Crushers including a shank and a renewable 'tip and having a hook element provided on each of said parts, said hook elements providing an interlocking hinge connection, and opposed surfaces provided between said tip and shank and adapted to operate as a stop for the hinge and to take the reactions of centrifugal force as well as the reactions of the crushing blow, the center of gravity of the tip being So disposed with relation to the hinge that the tip is held' against the stop by centrifugal force.

2. A hammer for rotary Crushers including a shank and a renewable tip and having v a hook element provided on each of said parts, said hook Aelements providing an interlocking hinge connection, and opposed surfaces provided between said tip and shank, contact between said surfaces being maintained by a force which is the resultant of the centrifugal force acting on the shank and of the centrifugal force acting on the tip.

3. A hammer for rotary Crushers including a shank and a renewable tip and having a hook element provided on each of said parts, said hook elements providing an interlocking hinge connection, and opposed surfaces provided between said tip and shank and adapted to operate as a stop for the hinge and to take the reactions of centrifugal force as well as the react-ions of the crushing blow, the point of suspension of the shank and the hinge of the tip being angularly disposed with respect to the Crusher shaft.

4. A hammer for rotary Crushers including a shank and a renewable tip, a hinge for connecting said elements, and opposed surfaces provided between the tip and shank, contact between said surfaces being maintained by a force which is the resultant of the centrifugal force acting on the shank and of the centrifugal force acting on the tip.

5. In a rotary crusher, a hammer comprising a pivotally mounted shank having at one end a groove section and a hook shape section, and a renewable tip having a hook to cooperate with a hook shape section on the shank and a tongue to cooperate with the groove on the shank, the'oent-er of gravity of the tip being such that the tip is held against the arm by the centrifugal force due to the rotary motion of the Crusher.

VILLIAM C. BRIGGS. 

